SoundWall - Turn every Phone into a Synchronized Speaker (WebRTC + PWA)

Hi everyone 👋

I’d like to share a side project I’ve been building: SoundWall.

🎶 What is SoundWall?

SoundWall synchronizes multiple smartphones so they can play the same song at the exact same time — creating a small mobile sound wall.

It’s a fun experiment in real‑time audio synchronization using WebRTC and Progressive Web App technology.

⚙️ Tech stack

• WebRTC for timing synchronization
• PWA (installable, offline‑capable)
• Minimal backend — sync logic runs entirely on the client

🌍 Use cases

• spontaneous outdoor sessions
• mini‑parties without Bluetooth speakers
• creative audio experiments

💬 Why I’m sharing

I’d love to get feedback from the community, especially on:

• WebRTC synchronization strategies
• timing optimization
• PWA best practices

🔗 Demo

https://soundwall.bolt.host

Thanks for reading — I’d love to hear your thoughts, ideas, or suggestions!

— Konstantinos